CN109755853B - Dye laser device using nile red organic solvent as gain medium - Google Patents
Dye laser device using nile red organic solvent as gain medium Download PDFInfo
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- CN109755853B CN109755853B CN201910184083.7A CN201910184083A CN109755853B CN 109755853 B CN109755853 B CN 109755853B CN 201910184083 A CN201910184083 A CN 201910184083A CN 109755853 B CN109755853 B CN 109755853B
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- VOFUROIFQGPCGE-UHFFFAOYSA-N nile red Chemical compound C1=CC=C2C3=NC4=CC=C(N(CC)CC)C=C4OC3=CC(=O)C2=C1 VOFUROIFQGPCGE-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000003960 organic solvent Substances 0.000 title claims abstract description 25
- 238000005086 pumping Methods 0.000 claims abstract description 41
- 239000010453 quartz Substances 0.000 claims abstract description 21
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 239000002904 solvent Substances 0.000 claims abstract description 12
- 238000011161 development Methods 0.000 claims abstract description 4
- 238000007614 solvation Methods 0.000 claims abstract description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 92
- 239000000975 dye Substances 0.000 claims description 48
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 42
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 25
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 22
- VYXSBFYARXAAKO-WTKGSRSZSA-N chembl402140 Chemical compound Cl.C1=2C=C(C)C(NCC)=CC=2OC2=C\C(=N/CC)C(C)=CC2=C1C1=CC=CC=C1C(=O)OCC VYXSBFYARXAAKO-WTKGSRSZSA-N 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 8
- 239000013078 crystal Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000012046 mixed solvent Substances 0.000 claims description 7
- 238000002310 reflectometry Methods 0.000 claims description 6
- 238000002834 transmittance Methods 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 claims description 3
- 238000009304 pastoral farming Methods 0.000 claims description 3
- 239000007850 fluorescent dye Substances 0.000 claims description 2
- WYOHGPUPVHHUGO-UHFFFAOYSA-K potassium;oxygen(2-);titanium(4+);phosphate Chemical group [O-2].[K+].[Ti+4].[O-]P([O-])([O-])=O WYOHGPUPVHHUGO-UHFFFAOYSA-K 0.000 claims description 2
- 239000001044 red dye Substances 0.000 claims description 2
- 238000010183 spectrum analysis Methods 0.000 claims 2
- 239000013307 optical fiber Substances 0.000 claims 1
- 239000000243 solution Substances 0.000 description 40
- 238000001228 spectrum Methods 0.000 description 22
- 238000005516 engineering process Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000002189 fluorescence spectrum Methods 0.000 description 3
- 239000000990 laser dye Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
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- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
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- 239000011259 mixed solution Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010979 ruby Substances 0.000 description 2
- 229910001750 ruby Inorganic materials 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
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- 239000006185 dispersion Substances 0.000 description 1
- PSLIMVZEAPALCD-UHFFFAOYSA-N ethanol;ethoxyethane Chemical compound CCO.CCOCC PSLIMVZEAPALCD-UHFFFAOYSA-N 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 1
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- ANRHNWWPFJCPAZ-UHFFFAOYSA-M thionine Chemical compound [Cl-].C1=CC(N)=CC2=[S+]C3=CC(N)=CC=C3N=C21 ANRHNWWPFJCPAZ-UHFFFAOYSA-M 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a dye laser device taking a nile red organic solvent as a gain medium, which comprises a frequency doubling Nd-YAG laser, an optical system and a dye laser resonant cavity, wherein the frequency doubling Nd-YAG laser is taken as a pumping source, and the dye laser resonant cavity comprises a quartz cuvette filled with the nile red organic solvent. The invention adopts Nile red as a laser gain medium, utilizes the solvation color development characteristic of Nile red, namely fluorescence/laser intensity in different organic solvents is related to the central wavelength and the polarity of the solvents, and obtains the laser output in a 78nm tuning range and the result of dual-wavelength 'proportion laser' by changing the polarity of the system.
Description
Technical Field
The invention relates to a dye laser, in particular to a dye laser device taking a nile red organic solvent as a gain medium.
Background
Laser technology has evolved dramatically for over 50 years since the first ruby laser in the 1960 s world. The laser has the characteristics of good monochromaticity, strong directivity, high brightness and the like, the wavelength range of the laser working substances is from soft X-rays to far infrared rays, so that the application range of the laser working substances is very wide, and a plurality of application technical fields such as laser processing technology, laser detection and metering technology, laser spectrum technology, nonlinear optics, laser chemistry, laser radar, laser weapons, spectrum detection technology of atmospheric environment and the like are formed by combining a plurality of subjects at present. Along with the increasing maturity of the laser technology, the laser technology plays an increasingly huge role in various fields of natural science, from army to civil use, from scientific research to teaching, from industry to agriculture and other fields.
Since the advent of the laser in 1960, tunable functions have been one of the important contents of laser research. The core device of the tunable laser is a tunable laser medium with a broadband energy level structure. Among the many lasers, dye lasers are the subject of intense investigation by researchers studying tunable lasers. Dye lasers are lasers in which a certain organic dye is dissolved in a certain solvent (methanol, ethanol, water, etc.) as a gain medium. Stockman in 1964 began to study organic dye lasers at the earliest; the laser output was first obtained by pumping cyanine dyes with ruby lasers in 1966 by Sorokin and Lankurd, and dye lasers began to develop rapidly. In 1967, soffer and Farland replaced a reflecting mirror of the resonant cavity with a diffraction grating, so that not only can the output spectrum be compressed, but also a continuous tunable range of tens of nanometers can be obtained, and a new method is provided for obtaining the tunable output of the dye laser.
Dye lasers with tuning ranges up to several microns are the most widely used tunable lasers. The dye laser has the characteristics of wide output spectral line range, high power, easy control of absorption and gain and the like, and the most important point is that the output laser wavelength is continuously adjustable in a very wide range. The most commonly used and traditional tuning method is to compress and tune the output broadband laser by tuning optical elements such as diffraction gratings, dispersion prisms, F-P etalons, etc. in or outside the laser cavity. This method of tuning with a dispersive element, while having a relatively large tuning range, has some drawbacks such as neglecting part of the tuning range and lack of functionality to achieve dual wavelength laser output. In addition, very fine manipulation is required during tuning, increasing the difficulty of manipulation.
Disclosure of Invention
The invention aims to design a dye laser system using a nile red organic solvent as a gain medium by adopting a novel laser dye nile red.
The invention adopts the technical scheme that: a dye laser device using nile red organic solvent as gain medium comprises a laser pumping source, an optical system and a laser dye resonant cavity. YAG solid laser, the laser pumping source 1 is Nd, the light beam emitted by the pumping source is subjected to frequency doubling output light through the frequency doubling optical crystal 2, the output energy is regulated by the half-wave plate 3 and the polaroid 4 together, the light path direction is changed through the first total reflection mirror 5 and the second total reflection mirror 6, the light path direction is changed through the beam splitting mirror 7, one part of pumping light is connected into the energy meter 16 through the third total reflection mirror 15 to monitor the pumping energy, and the other part of pumping light is directly pumped into the dye laser gain system. The pump light enters a gain system after passing through a focusing lens 8 and a small aperture diaphragm 9, the gain system comprises a plane dichroic mirror 10, a quartz cuvette 11 filled with different organic solvents of Nile red, a reflective blazed grating 12 and a tuning total reflection mirror 13, the plane dichroic mirror 10 is positioned 10mm behind the small aperture diaphragm 9, the quartz cuvette 11 filled with the organic solvents of Nile red is positioned 15mm behind the plane dichroic mirror 10, the incident point of the incident light on the reflective blazed grating 12 is 20mm away from the right window of the quartz cuvette 11, the surface of the tuning total reflection mirror 13 is parallel to the grating surface of the reflective blazed grating 12, the distance is 10mm, and finally, the output laser is accessed into a spectrometer 14 for analysis.
The nile red used in the experiment is a fluorescent dye, the molecular formula of the nile red is C20H18N2O2, and the organic solvents are ethanol, acetone, diethyl ether and toluene respectively. The content GC of ethanol, acetone, diethyl ether and toluene solvent is more than or equal to 99.5 percent. The concentration of nile red in pure ethanol solution was 60 μg/mL, and in pure acetone, pure toluene, and pure diethyl ether solution was 50 μg/mL.
The laser pumping source is an Nd-YAG solid laser, and the output laser wavelength is 1064nm. The frequency multiplication crystal passed by the Nd-YAG solid laser is a potassium titanyl phosphate (KTP) crystal.
Wherein the first total reflection mirror 5, the second total reflection mirror 6 and the third total reflection mirror 15 are surface-coated dichroic mirrors of 1064nm/532nm, and the reflectivity R is more than 99.5% around 532 nm. The beam splitting ratio of the beam splitter 7 is 1:9, wherein 90% of the pumping light is reflected by the beam splitter 7 and then reflected by the third total reflection mirror 15, the pumping light is connected to the energy meter 16 to monitor the pumping energy, and the pumping light with the energy of 10% passes through the beam splitter 7 to be used as a direct pumping source of the dye laser gain system. The pumping laser passing through the beam splitter 7 enters the dye laser resonant cavity after passing through a focusing lens 8 with the focal length of 17cm and a small aperture diaphragm 9 with the aperture of 5mm.
The laser dye resonant cavity comprises a planar dichroic mirror 10, a quartz cuvette 11, a reflective blazed grating 12 and a tuning total reflection mirror, the total length of the resonant cavity is about 5cm, the planar dichroic mirror 10 is a planar dichroic mirror, and a coating film enables the transmittance T of the planar dichroic mirror at 532nm to be more than 95%, and the reflectivity R of the planar dichroic mirror at 560-700 nm to be more than 95%. The quartz cuvette 11 is used for containing different organic solutions of nile red, the optical path is 5mm, and the transmittance of the two optical surfaces is more than 99.5% in the range of 400-700 nm. The pump light passes through the planar dichroic mirror 10 and the quartz cuvette 11 and glances into the reflective blazed grating 12. The reflective blazed grating 12 (1200 lines/mm) is a common blazed grating with a blazed wavelength of 500nm, the size of the grating is 10cm x 10cm, and the tuning total reflection mirror 13 is a broadband reflection mirror with an aluminized film. The stronger 1-order diffraction light is fed back into the resonant cavity through the tuning total reflection mirror 13 to continue oscillation, and the dye laser transmitted along the axial direction is finally output along the 0-order direction of grating diffraction. The tunable output of dye laser can be realized by rotationally tuning the total reflection mirror 13 by fixing the grazing incidence angle of the grating.
The tunable total reflection mirror is kept from rotating, pure diethyl ether and pure ethanol solvent are prepared into a mixed solvent according to the content ratio of 10:0 to 0:10 by utilizing the solvation color development characteristic of nile red, and the nile red is respectively dissolved in the mixed solvent at the concentration of 50 mug/mL, so that the tunable output of dye laser is realized.
The method for realizing the proportional laser dual-wavelength output comprises the following steps: a quartz cuvette with double layers connected in series is adopted, wherein a front cavity is filled with 100 mu G/mL of rhodamine 6G ethanol solution, a rear cavity is filled with nile red ethanol solution, the concentrations of the ethanol solution are respectively configured to be 120 mu G/mL,100 mu G/mL,80 mu G/mL,60 mu G/mL,40 mu G/mL,20 mu G/mL and 10 mu G/mL, a group of dual-wavelength laser outputs are obtained, the peak wavelength of the output laser of the rhodamine 6G dye is kept unchanged, and the output laser wavelength and the relative intensity of the nile red dye are changed continuously along with the change of the concentration, so that a group of 'proportion laser' outputs are obtained.
The invention has the following advantages:
1. the solvatochromic characteristic of the nile red is utilized, and the polarity of the environment is changed by mixing an organic solvent, so that the tuning of the nile red output laser is obtained.
2. On the basis of solvent polarity tuning, grating is added to perform compression spectrum width and output tuning, so that the tuning range of the nile red organic solution is expanded, and the whole tuning range reaches approximately 80nm.
3. The ethanol solution of rhodamine and the ethanol solution of nile red are pumped simultaneously by utilizing two quartz cuvettes connected in series, and the concentration of nile red in the ethanol solution is continuously changed to obtain a group of output of 'proportional laser', so that the method can be used for calibrating a tiny amount, detecting the concentration of the solution, expanding the tuning range of a dye laser and the like.
4. The whole structure is simple, the operation is easy, and the cost is lower.
Drawings
Fig. 1 is a diagram of an optical path for realizing grating tuning and solvent polarity tuning in the patent of the present invention.
FIG. 2 is the output fluorescence versus laser spectra of the nile red ethanol solution of example 1.
FIG. 3 is a graph showing the variation of the output energy and the half-width of the Nile red ethanol solution with the pump energy in example 1.
Fig. 4, 5 and 6 show the fluorescence output and the laser spectra of the nile red acetone solution, the nile red toluene solution and the nile red diethyl ether solution in examples 2, 3 and 4, respectively.
FIG. 7 is a graph showing the laser tuning output spectrum of example 5 Nile red in diethyl ether/ethanol mixed solvent by varying the solvent ratio.
FIG. 8 is a graph showing the overall laser tuning output spectrum of example 5 Nile red in an ethyl ether-ethanol mixed solution, with the total reflection mirror being rotationally tuned based on polarity tuning.
FIG. 9 is a schematic diagram of the optical path of a serial pumped rhodamine 6G/Nile red alcohol solution in example 6.
FIG. 10 is a graph of the "proportional laser" output spectra of a series pumped rhodamine 6G/Nile red ethanol solution in example 6.
Fig. 11 is a comparison of the tuning range of nile red laser at different concentrations obtained for the rhodamine 6G/nile red ethanol mixed solution system of example 6, and the tuning range of laser output at different concentrations in a single nile red/ethanol solution.
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example 1: fig. 1 is a diagram of an optical path for realizing grating tuning and solvent polarity tuning in the present invention. The whole dye laser device comprises a laser pumping source, an optical system and a dye laser resonant cavity. The laser pumping source 1 is a Nd-YAG solid laser, and outputs through frequency multiplication of the KTP crystal 2. The optical system comprises an energy regulating system consisting of a half-wave plate 3 and a polaroid 4, a first total reflecting mirror 5, a second total reflecting mirror 6, a third total reflecting mirror 15, a beam splitter 7, a focusing lens 8 and an aperture diaphragm 9. The first total reflecting mirror 5, the second total reflecting mirror 6 and the third total reflecting mirror 15 are 1064nm/532nm dichroic mirrors with surface coating films, and the reflectivity R of about 532nm is more than 99.5%. The beam splitting ratio of the beam splitter 7 is 1:9, wherein 90% of the pumping light is reflected by the beam splitter 7 and then reflected by the third total reflection mirror 15, the pumping light is connected to the energy meter 16 to monitor the pumping energy, and the pumping light with the energy of 10% passes through the beam splitter 7 to be used as a direct pumping source of the dye laser gain system. The pumping laser passing through the beam splitter 7 enters the dye laser resonant cavity after passing through a convex lens 8 with the focal length of 17cm and a small aperture diaphragm 9 with the aperture of 5mm. The dye laser resonant cavity comprises a planar dichroic mirror 10, a quartz cuvette 11, a reflective blazed grating 12 and a tuning total reflection mirror, the full length of the dye laser resonant cavity is about 5cm, the planar dichroic mirror 10 is coated with a film so that the transmittance T of the dye laser resonant cavity at 532nm is more than 95%, and the reflectivity R of the dye laser resonant cavity in the range of 560-700 nm is more than 95%. The quartz cuvette 11 is used for containing ethanol solution of nile red, the concentration is 60 mug/mL, the optical path is 5mm, and the transmittance of the two optical surfaces is over 99.5% in the range of 400-700 nm. The pump light passes through the planar dichroic mirror 10 and the quartz cuvette 11 and glances into the reflective blazed grating 12. The reflective blazed grating 12 (1200 lines/mm) is a common blazed grating with a blazed wavelength of 500nm, the size of the grating is 10cm x 10cm, and the tuning total reflection mirror 13 is a broadband reflection mirror with an aluminized film.
As shown in fig. 2 and 3, the tunable total reflection mirror is kept not to rotate, and the fluorescence and laser spectrum, output energy and spectrum half-width of nile red in ethanol solution are obtained by continuously increasing pumping energy. In fig. 2, curve 1 represents the fluorescence spectrum of the ethanol solution below the pumping threshold in example 1, and curve 2 represents the laser spectrum of the nile red/ethanol solution obtained after exceeding the pumping energy by more than the threshold. In fig. 3, curves 1 and 2 respectively represent the half-width of the output spectrum and the variation curve of the output energy with the pump energy near the threshold, and curve 3 in the inset represents the variation curve of the overall input and output energy obtained in the experiment. With the continuous increase of the pumping energy, the width of the output fluorescence spectrum gradually decreases from 46nm, when the pumping energy reaches 3.1mJ/cm 2 The output spectral width was reduced to 6nm with a center wavelength at 642 nm. The pumping energy is continuously increased, the central wavelength and the half-width of the spectrum of the output laser are unchanged, and the overall slope efficiency reaches 1.05%.
Example 2: this example differs from example 1 in that the Nile red/ethanol solution in the quartz cuvette 11 was replaced with Cheng Niluo red/acetone solution at a concentration of 50 μg/mL.
Example 3: this example differs from example 1 in that the Nile red/ethanol solution in the quartz cuvette 11 was replaced with Cheng Niluo red/toluene solution at a concentration of 50. Mu.g/mL.
Example 4: this example differs from example 1 in that the Nile red/ethanol solution in the quartz cuvette 11 was replaced with Cheng Niluo red/diethyl ether solution at a concentration of 50. Mu.g/mL.
The fluorescence and laser spectra of the different solvents of nile red obtained in examples 2, 3, 4 are shown in fig. 4, 5, 6. Curves 1 in fig. 4, 5 and 6 each represent the fluorescence spectrum of the nile red organic solvent obtained in this example, and curves 2 each represent the laser spectrum of the nile red organic solvent obtained in this example. It is known that nile red exhibits very strong fluorescence and lasing properties in many organic solvents. The polarity of the organic solvents is different, so that the central wavelength of the emitted laser is also different, and the central wavelengths are respectively 620nm, 618nm and 608nm in acetone, toluene and diethyl ether.
Example 5: in consideration of the solvatochromic characteristics of nile red, diethyl ether and ethanol are prepared into mixed solvents according to a certain proportion, the proportion of the diethyl ether solvent to the ethanol solvent is respectively 10:0, 9:1, 8:2, 7:3, 6:4, 5:5, 4:6, 3:7, 2:8, 1:9 and 0:10, and the concentration of nile red in the mixed solvents is controlled to be 50 mug/mL unchanged. The polar tuning spectrum shown in fig. 7 was obtained with an overall tuning range of 603nm to 643nm, reaching a tuning range of 40 nm.
Fig. 8 shows a tuned output spectrum obtained by rotating the total reflection mirror 13 based on example 5. The stronger 1-order diffraction light is fed back into the resonant cavity through the tuning total reflection mirror 13 to continue oscillation, and the dye laser transmitted along the axial direction is finally output along the 0-order direction of grating diffraction. The tunable output of dye laser can be realized by rotationally tuning the total reflection mirror 13 by fixing the grazing incidence angle of the grating. The tuning range of example 5 was extended by grating tuning, from 582nm to 660nm, achieving a tuning output of 78 nm.
Example 6: fig. 9 is a partial light path diagram of the dual wavelength "proportional laser" output implemented in the present invention. The dye laser resonant cavity adopts a parallel plane cavity structure and comprises a plane dichroic mirror 10, a series cuvette pool 17, an output coupling mirror 18 and an output filter 19. Planar dichroic mirror 10 is the same as in embodiments 1-5. The output coupling mirror 18 is a partial mirror with a reflectivity of 85% in the range of 400nm to 700nm, and the output filter 19 is a 532nm band-stop filter. The tandem cuvette cell 17 is formed by gluing two single-layer quartz cuvettes, and the optical path of each cuvette is 5mm. One of the cells of the tandem cuvette cell 17, which is close to the pump light, was filled with an ethanol solution of rhodamine 6G at a concentration of 100. Mu.g/mL, which remained unchanged. Another pool was filled with Nile red in ethanol at concentrations of 120. Mu.g/mL, 100. Mu.g/mL, 80. Mu.g/mL, 60. Mu.g/mL, 40. Mu.g/mL, 20. Mu.g/mL, and 10. Mu.g/mL, respectively. The pump light vertically pumps the cuvette pool 17 in series, and a group of dual-wavelength output laser spectrograms are obtained by setting nile red ethanol solutions with different concentrations. Using the laser peak of rhodamine 6G ethanol solution as a standard, a set of output "proportional laser" spectra for rhodamine 6G/Nile red ethanol solution were obtained, curve 1 in FIG. 10 representing the pump spectra at 532nm, and curves 2, 3, 4, 5, 6, 7, 8 representing the laser spectra obtained in Nile red/ethanol solutions of different concentrations in example 6, at concentrations of 10 μg/mL,20 μg/mL,40 μg/mL,60 μg/mL,80 μg/mL,100 μg/mL, and 120 μg/mL, respectively. In fig. 11, the scattered point 1 shows the concentration tuning output range obtained in a single ethanol solution, and the scattered point 2 shows the concentration tuning output range of the "proportional laser" obtained in such a tandem cuvette cell, as shown in fig. 10 and 11. By gradually reducing the concentration of the nile red ethanol solution from 120 mug/mL to 10 mug/mL, the center wavelength range of one peak of the obtained output dual-wavelength laser is 645nm to 610nm, which is far larger than the tuning (about 3 nm) range of changing the concentration in a pure organic solution (such as ethanol).
The invention utilizes the solvation color development characteristic of nile red, carries out pulse pumping through a double-frequency Nd-YAG solid laser, carries out polarity tuning through changing the polarity of an organic solvent, and carries out grating tuning through rotating a tuning total reflection mirror to obtain a group of continuous adjustable output spectrums ranging from 582nm to 660 nm. Meanwhile, the ethanol solution of rhodamine 6G and the ethanol solution of nile red are placed in a serial cuvette pool for serial pumping, and a group of dual-wavelength 'proportion laser' outputs are obtained by changing the concentration of the nile red solution, so that the method has important application prospects in the fields of micro detection, terahertz light sources, blood detection, tuning range expansion of a tuning laser and the like.
Claims (5)
1. A dye laser device using nile red organic solvent as gain medium, characterized in that: YAG solid laser, the light beam that the laser pumping source (1) sends out gets the frequency multiplication output light through the frequency doubling optical crystal (2), regulate the output energy jointly by half-wave plate (3) and polaroid (4), after changing the light path direction through first total reflecting mirror (5) and second total reflecting mirror (6), through the beam splitting mirror (7), a part of pumping light is connected into the energy meter (16) through the third total reflecting mirror (15) to monitor pumping energy, another part directly pumps the dye laser resonant cavity, the pumping light enters the dye laser resonant cavity after focusing lens (8) and aperture diaphragm (9), the dye laser resonant cavity includes the plane dichroic grating (11) with different organic solvents of nile red, reflecting type blazed grating (12) and tuning type total reflecting mirror (13), the plane dichroic mirror (10) is located behind aperture diaphragm (9) 10mm, the quartz dichroic grating (11) with nile red organic solvents is located on the surface of the plane dichroic mirror (12 mm, the plane dichroic grating (12) is located on the surface of the plane dichroic mirror (12 mm), the plane dichroic grating (12 mm) is connected into the optical fiber, the spectral analysis is carried out on the surface of the plane dichroic mirror (12 mm, the spectral analysis is carried out;
the nile red used in the experiment is a fluorescent dye with a molecular formula of C 20 H 18 N 2 O 2 The organic solvents are ethanol, acetone, diethyl ether and toluene respectively, and the content GC of the ethanol, the acetone, the diethyl ether and the toluene solvents is more than or equal to 99.5 percent;
the concentration value of the nile red in the pure ethanol solution is 60 mug/mL, and the concentration value of the nile red in the pure acetone, the pure toluene and the pure diethyl ether solution is 50 mug/mL;
the dye laser gain system resonant cavity comprises a plane dichroic mirror (10), a quartz cuvette (11), a reflective blazed grating (12) and a tuning total reflection mirror (13), the full length of the resonant cavity is 5cm larger, the plane dichroic mirror (10) is coated with a film to ensure that the resonant cavity has a transmittance T at 532nm>95%, reflectance R within 560-700 nm>95%; the quartz cuvette (11) is used for containing different organic solutions of nile red, the optical path is 5mm, and the two optical surfaces are in the range of 400-700 nmThe transmittance in the surrounding area exceeds 99.5%; the pump light is grazing-shot into the reflective blazed grating (12) through the plane dichroic mirror (10) and the quartz cuvette (11); the reflective blazed grating (12) is a common grating with a blazed wavelength of 500nm, 1200 lines/mm and a size of 10cmThe tuning total reflection mirror (13) is a broadband reflection mirror with an aluminized film of 10 cm; the stronger 1-order diffraction light is fed back into the resonant cavity through the tuning total reflection mirror (13) to continue oscillation, and dye laser transmitted along the axial direction is finally output along the 0-order direction of grating diffraction; the grazing incidence angle of the grating is fixed, and tunable output of dye laser can be realized by rotating and tuning the total reflection mirror (13);
keeping the tuning total reflection mirror (13) not rotating, and preparing pure diethyl ether and pure ethanol solvent into a mixed solvent according to the content ratio of 10:0 to 0:10 by utilizing the solvation color development characteristic of nile red, wherein the nile red is dissolved in the mixed solvent at the concentration of 50 mug/mL, so as to realize tunable output of dye laser;
the method for realizing the dual-wavelength output of the proportional laser comprises the following steps: a quartz cuvette with double layers connected in series is adopted, wherein a front cavity is filled with 100 mu G/mL of rhodamine 6G ethanol solution, a rear cavity is filled with nile red ethanol solution, the concentrations of the ethanol solution are respectively configured to be 120 mu G/mL,100 mu G/mL,80 mu G/mL,60 mu G/mL,40 mu G/mL,20 mu G/mL and 10 mu G/mL, a group of dual-wavelength laser outputs are obtained, the peak wavelength of the output laser of the rhodamine 6G dye is kept unchanged, and the output laser wavelength and the relative intensity of the nile red dye are changed continuously along with the change of the concentration, so that a group of 'proportion laser' outputs are obtained.
2. A dye laser system using nile red organic solvent as gain medium according to claim 1, characterized in that: the laser pumping source (1) is an Nd-YAG solid laser, and the output laser wavelength is 1064nm; the frequency multiplication crystal passed by the Nd-YAG solid laser is a potassium titanyl phosphate (KTP) crystal.
3. A dye laser system using nile red organic solvent as gain medium according to claim 1, characterized in that: the first total reflection mirror (5), the second total reflection mirror (6) and the third total reflection mirror (15) are surface-coated dichroic mirrors with the thickness of 1064nm/532nm, and the reflectivity R is more than 99.5% around 532 nm.
4. A dye laser system using nile red organic solvent as gain medium according to claim 1, characterized in that: the beam splitting ratio of the beam splitter (7) is 1:9, wherein 90% of pumping light is reflected by the beam splitter (7) and reflected by the third total reflection mirror (15) and then is connected with the energy meter (16) to monitor pumping energy, and the pumping light with 10% of energy passes through the beam splitter (7) to serve as a direct pumping source of the dye laser gain system.
5. A dye laser system using nile red organic solvent as gain medium according to claim 1, characterized in that: the pumping laser passing through the beam splitter (7) enters the dye laser resonant cavity after passing through a focusing lens (8) with the focal length of 17cm and a small aperture diaphragm (9) with the aperture of 5mm.
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| US5136596A (en) * | 1989-09-26 | 1992-08-04 | Excel Technology, Inc. | Broadly tunable, high repetition rate solid state and dye lasers and uses thereof |
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| CN210007099U (en) * | 2019-03-12 | 2020-01-31 | 中国科学技术大学 | Dye laser device with Nile red organic solvents as gain media |
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| US5530711A (en) * | 1994-09-01 | 1996-06-25 | The United States Of America As Represented By The Secretary Of The Navy | Low threshold diode-pumped tunable dye laser |
| CN103201914A (en) * | 2010-11-10 | 2013-07-10 | 约瑟夫·斯特凡学院 | Spherical liquid-crystal laser |
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